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Red Indians is a British term for Native Americans, American terms for this ethnic group include redskin, redhead and red man, though they are not the preferred terms.[7]
Red is any of a number of similar colors evoked by light consisting predominantly of the longest wavelengths of light discernible by the human eye, in the wavelength range of roughly 630–700 nm.[8]
Red lasers, used in early compact disc technologies, are being replaced by blue lasers, as red's long wavelength causes the laser's recordings to take up more space on the disc than blue lasers.[10]
Red is used as one of the additive primary colors of light, complementary to cyan, in RGB color systems. Red is also one of the subtractive primary colors of RYB color space but not CMYK color space.[12]